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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hudi.common.table.view;
import org.apache.hudi.common.config.HoodieCommonConfig;
import org.apache.hudi.common.config.HoodieMetadataConfig;
import org.apache.hudi.common.config.HoodieMetaserverConfig;
import org.apache.hudi.common.config.SerializableConfiguration;
import org.apache.hudi.common.engine.HoodieEngineContext;
import org.apache.hudi.common.function.SerializableSupplier;
import org.apache.hudi.common.table.HoodieTableMetaClient;
import org.apache.hudi.common.table.timeline.HoodieTimeline;
import org.apache.hudi.common.util.Functions.Function2;
import org.apache.hudi.common.util.ReflectionUtils;
import org.apache.hudi.common.util.ValidationUtils;
import org.apache.hudi.metadata.HoodieMetadataFileSystemView;
import org.apache.hudi.metadata.HoodieTableMetadata;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import java.util.concurrent.ConcurrentHashMap;
/**
* A container that can potentially hold one or more table's file-system views. There is one view for each table.
* This is a view built against a timeline containing completed actions. In an embedded timeline-server mode, this
* typically holds only one table's view. In a stand-alone server mode, this can hold more than one table's views.
*
* FileSystemView can be stored "locally" using the following storage mechanisms: a. In Memory b. Spillable Map c.
* RocksDB
*
* But there can be cases where the file-system view is managed remoted. For example : Embedded Timeline Server). In
* this case, the clients will configure a remote filesystem view client (RemoteHoodieTableFileSystemView) for the
* table which can connect to the remote file system view and fetch views. THere are 2 modes here : REMOTE_FIRST and
* REMOTE_ONLY REMOTE_FIRST : The file-system view implementation on client side will act as a remote proxy. In case, if
* there is problem (or exceptions) querying remote file-system view, a backup local file-system view(using either one
* of in-memory, spillable, rocksDB) is used to server file-system view queries REMOTE_ONLY : In this case, there is no
* backup local file-system view. If there is problem (or exceptions) querying remote file-system view, then the
* exceptions are percolated back to client.
*
* FileSystemViewManager is designed to encapsulate the file-system view storage from clients using the file-system
* view. FileSystemViewManager uses a factory to construct specific implementation of file-system view and passes it to
* clients for querying.
*/
public class FileSystemViewManager {
private static final Logger LOG = LogManager.getLogger(FileSystemViewManager.class);
private static final String HOODIE_METASERVER_FILE_SYSTEM_VIEW_CLASS = "org.apache.hudi.common.table.view.HoodieMetaserverFileSystemView";
private final SerializableConfiguration conf;
// The View Storage config used to store file-system views
private final FileSystemViewStorageConfig viewStorageConfig;
// Map from Base-Path to View
private final ConcurrentHashMap globalViewMap;
// Factory Map to create file-system views
private final Function2 viewCreator;
private FileSystemViewManager(HoodieEngineContext context, FileSystemViewStorageConfig viewStorageConfig,
Function2 viewCreator) {
this.conf = context.getHadoopConf();
this.viewStorageConfig = viewStorageConfig;
this.globalViewMap = new ConcurrentHashMap<>();
this.viewCreator = viewCreator;
}
/**
* Drops reference to File-System Views. Future calls to view results in creating a new view
*
* @param basePath
*/
public void clearFileSystemView(String basePath) {
SyncableFileSystemView view = globalViewMap.remove(basePath);
if (view != null) {
view.close();
}
}
/**
* Main API to get the file-system view for the base-path.
*
* @param basePath
* @return
*/
public SyncableFileSystemView getFileSystemView(String basePath) {
return globalViewMap.computeIfAbsent(basePath, (path) -> {
HoodieTableMetaClient metaClient = HoodieTableMetaClient.builder().setConf(conf.newCopy()).setBasePath(path).build();
return viewCreator.apply(metaClient, viewStorageConfig);
});
}
/**
* Main API to get the file-system view for the base-path.
*
* @param metaClient HoodieTableMetaClient
* @return
*/
public SyncableFileSystemView getFileSystemView(HoodieTableMetaClient metaClient) {
return globalViewMap.computeIfAbsent(metaClient.getBasePath(),
(path) -> viewCreator.apply(metaClient, viewStorageConfig));
}
/**
* Closes all views opened.
*/
public void close() {
if (!this.globalViewMap.isEmpty()) {
this.globalViewMap.values().forEach(SyncableFileSystemView::close);
this.globalViewMap.clear();
}
}
// FACTORY METHODS FOR CREATING FILE-SYSTEM VIEWS
/**
* Create RocksDB based file System view for a table.
*
* @param conf Hadoop Configuration
* @param viewConf View Storage Configuration
* @param metaClient HoodieTableMetaClient
* @return
*/
private static RocksDbBasedFileSystemView createRocksDBBasedFileSystemView(SerializableConfiguration conf,
FileSystemViewStorageConfig viewConf, HoodieTableMetaClient metaClient) {
HoodieTimeline timeline = metaClient.getActiveTimeline().filterCompletedAndCompactionInstants();
return new RocksDbBasedFileSystemView(metaClient, timeline, viewConf);
}
/**
* Create a spillable Map based file System view for a table.
*
* @param conf Hadoop Configuration
* @param viewConf View Storage Configuration
* @param metaClient HoodieTableMetaClient
* @return
*/
private static SpillableMapBasedFileSystemView createSpillableMapBasedFileSystemView(SerializableConfiguration conf,
FileSystemViewStorageConfig viewConf, HoodieTableMetaClient metaClient, HoodieCommonConfig commonConfig) {
LOG.info("Creating SpillableMap based view for basePath " + metaClient.getBasePath());
HoodieTimeline timeline = metaClient.getActiveTimeline().filterCompletedAndCompactionInstants();
return new SpillableMapBasedFileSystemView(metaClient, timeline, viewConf, commonConfig);
}
/**
* Create an in-memory file System view for a table.
*
*/
private static HoodieTableFileSystemView createInMemoryFileSystemView(HoodieMetadataConfig metadataConfig, FileSystemViewStorageConfig viewConf,
HoodieTableMetaClient metaClient, SerializableSupplier metadataSupplier) {
LOG.info("Creating InMemory based view for basePath " + metaClient.getBasePath());
HoodieTimeline timeline = metaClient.getActiveTimeline().filterCompletedAndCompactionInstants();
if (metadataConfig.enabled()) {
ValidationUtils.checkArgument(metadataSupplier != null, "Metadata supplier is null. Cannot instantiate metadata file system view");
return new HoodieMetadataFileSystemView(metaClient, metaClient.getActiveTimeline().filterCompletedAndCompactionInstants(),
metadataSupplier.get());
}
if (metaClient.getMetaserverConfig().isMetaserverEnabled()) {
return (HoodieTableFileSystemView) ReflectionUtils.loadClass(HOODIE_METASERVER_FILE_SYSTEM_VIEW_CLASS,
new Class[] {HoodieTableMetaClient.class, HoodieTimeline.class, HoodieMetaserverConfig.class},
metaClient, metaClient.getActiveTimeline().getCommitsTimeline().filterCompletedInstants(), metaClient.getMetaserverConfig());
}
return new HoodieTableFileSystemView(metaClient, timeline, viewConf.isIncrementalTimelineSyncEnabled());
}
public static HoodieTableFileSystemView createInMemoryFileSystemView(HoodieEngineContext engineContext, HoodieTableMetaClient metaClient,
HoodieMetadataConfig metadataConfig) {
return createInMemoryFileSystemViewWithTimeline(engineContext, metaClient, metadataConfig,
metaClient.getActiveTimeline().getCommitsTimeline().filterCompletedInstants());
}
public static HoodieTableFileSystemView createInMemoryFileSystemViewWithTimeline(HoodieEngineContext engineContext,
HoodieTableMetaClient metaClient,
HoodieMetadataConfig metadataConfig,
HoodieTimeline timeline) {
LOG.info("Creating InMemory based view for basePath " + metaClient.getBasePath());
if (metadataConfig.enabled()) {
return new HoodieMetadataFileSystemView(engineContext, metaClient, timeline, metadataConfig);
}
if (metaClient.getMetaserverConfig().isMetaserverEnabled()) {
return (HoodieTableFileSystemView) ReflectionUtils.loadClass(HOODIE_METASERVER_FILE_SYSTEM_VIEW_CLASS,
new Class[] {HoodieTableMetaClient.class, HoodieTimeline.class, HoodieMetadataConfig.class},
metaClient, metaClient.getActiveTimeline().getCommitsTimeline().filterCompletedInstants(), metaClient.getMetaserverConfig());
}
return new HoodieTableFileSystemView(metaClient, timeline);
}
/**
* Create a remote file System view for a table.
*
* @param conf Hadoop Configuration
* @param viewConf View Storage Configuration
* @param metaClient Hoodie Table MetaClient for the table.
* @return
*/
private static RemoteHoodieTableFileSystemView createRemoteFileSystemView(SerializableConfiguration conf,
FileSystemViewStorageConfig viewConf, HoodieTableMetaClient metaClient) {
LOG.info("Creating remote view for basePath " + metaClient.getBasePath() + ". Server="
+ viewConf.getRemoteViewServerHost() + ":" + viewConf.getRemoteViewServerPort() + ", Timeout="
+ viewConf.getRemoteTimelineClientTimeoutSecs());
return new RemoteHoodieTableFileSystemView(metaClient, viewConf);
}
public static FileSystemViewManager createViewManager(final HoodieEngineContext context,
final HoodieMetadataConfig metadataConfig,
final FileSystemViewStorageConfig config,
final HoodieCommonConfig commonConfig) {
return createViewManager(context, metadataConfig, config, commonConfig, (SerializableSupplier) null);
}
public static FileSystemViewManager createViewManager(final HoodieEngineContext context,
final HoodieMetadataConfig metadataConfig,
final FileSystemViewStorageConfig config,
final HoodieCommonConfig commonConfig,
final String basePath) {
return createViewManager(context, metadataConfig, config, commonConfig,
() -> HoodieTableMetadata.create(context, metadataConfig, basePath, config.getSpillableDir(), true));
}
/**
* Main Factory method for building file-system views.
*
*/
public static FileSystemViewManager createViewManager(final HoodieEngineContext context,
final HoodieMetadataConfig metadataConfig,
final FileSystemViewStorageConfig config,
final HoodieCommonConfig commonConfig,
final SerializableSupplier metadataSupplier) {
LOG.info("Creating View Manager with storage type :" + config.getStorageType());
final SerializableConfiguration conf = context.getHadoopConf();
switch (config.getStorageType()) {
case EMBEDDED_KV_STORE:
LOG.info("Creating embedded rocks-db based Table View");
return new FileSystemViewManager(context, config,
(metaClient, viewConf) -> createRocksDBBasedFileSystemView(conf, viewConf, metaClient));
case SPILLABLE_DISK:
LOG.info("Creating Spillable Disk based Table View");
return new FileSystemViewManager(context, config,
(metaClient, viewConf) -> createSpillableMapBasedFileSystemView(conf, viewConf, metaClient, commonConfig));
case MEMORY:
LOG.info("Creating in-memory based Table View");
return new FileSystemViewManager(context, config,
(metaClient, viewConfig) -> createInMemoryFileSystemView(metadataConfig, viewConfig, metaClient, metadataSupplier));
case REMOTE_ONLY:
LOG.info("Creating remote only table view");
return new FileSystemViewManager(context, config, (metaClient, viewConfig) -> createRemoteFileSystemView(conf,
viewConfig, metaClient));
case REMOTE_FIRST:
LOG.info("Creating remote first table view");
return new FileSystemViewManager(context, config, (metaClient, viewConfig) -> {
RemoteHoodieTableFileSystemView remoteFileSystemView =
createRemoteFileSystemView(conf, viewConfig, metaClient);
SyncableFileSystemView secondaryView;
switch (viewConfig.getSecondaryStorageType()) {
case MEMORY:
secondaryView = createInMemoryFileSystemView(metadataConfig, viewConfig, metaClient, metadataSupplier);
break;
case EMBEDDED_KV_STORE:
secondaryView = createRocksDBBasedFileSystemView(conf, viewConfig, metaClient);
break;
case SPILLABLE_DISK:
secondaryView = createSpillableMapBasedFileSystemView(conf, viewConfig, metaClient, commonConfig);
break;
default:
throw new IllegalArgumentException("Secondary Storage type can only be in-memory or spillable. Was :"
+ viewConfig.getSecondaryStorageType());
}
return new PriorityBasedFileSystemView(remoteFileSystemView, secondaryView);
});
default:
throw new IllegalArgumentException("Unknown file system view type :" + config.getStorageType());
}
}
}
